© licensed to London News Pictures. 04/05/2011. London, UK. An important pink diamond weighing 10.99 carats with an estimated sale value of $9 to 16 million on show at Sotheby's as part of the upcoming Sale of Magnificent and Noble Jewels. The auction, which will take place on May 17th offers Jewels that have not been on the open market for 30 years. Please see special instructions for usage rates. Photo credit should read Ben Cawthra/LNP